Components of Working Capital - Accounts Receivable, Net Table (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Receivables [Abstract]
Trade receivables, net		$ 216,847	$ 160,194
Other receivables, net		45	45
Total accounts receivable, net	[1]	$ 216,892	$ 160,239

[1] Accounts receivable, net includes amounts receivable from affiliates (as defined in Note 1) of $72.6 million and $36.1 million as of December 31, 2018 and 2017, respectively.